Why are Las Vegas cabbies so weird about tips?

[AntonHeat]

You guys know that in countries outside North America that your not even supposed to tip, and that it is frowned upon. Unless you hand it directly to the waiter/host/etc but it is not expected.

Usally though 7-8$ fare I just hand the guy a 10 and its fine.

I've never really had any jackass taxi guys or w/e yet but im in Canada so.. [img]/images/graemlins/confused.gif[/img]